People familiar with the internal negotiations say Gov. Andrew Cuomo and legislative leaders have a tentative deal to enact the nation’s first gun control measure following the Newtown, Conn., school shooting.

The tentative agreement would further restrict New York’s ban on assault weapons and limit the size of magazines to seven bullets, rather than the current 10. Other elements, pushed by Republicans, would refine a mental health law that allows for civil confinement of people determined to be a threat to others.